Arduino switch case multiple variables code#

If you run the code above, for example, you will see three log statements, not one (as was the case with the if. When it does, however, Squirrel will run all of the blocks that follow. case structure, Squirrel evaluates the switch statement then works through each case value until it reaches one that matches the result of the evaluation.

The default keyword marks the code that will be run if none of the case statement cases are met. The structure should include a number of case statements for all of the possible values that we’re interested in. This time, the condition evaluates not to true or false but to a value. This works in a slightly different way to if. Server.log(''someValue' is neither 1 nor 2')

This is best shown with an example: local someValue = 1 case that provides a more clear means of enumerating the possible values and the code run if the variable has that value. Squirrel provides an alternative structure to use in these instances called switch. else structure, typically when you compare the same variable to a large sequence of possible values, each with its own block of code. Sometimes you can end up with a very long if. Short-circuiting saves you from having to nest separate comparison statements in cases where subsequent tests are dependent on an earlier one. If we swap the two sides of the & comparison, then the error will be triggered - the order of the sub-tests is crucial. This fails and so Squirrel never evaluates the left side of the OR statement. This does not happen because Squirrel evaluates the lefts side of the test statement first. The table, data, has no member value, so the the sub-test data.value = 42 should trigger an ‘index not found’ error. If ('value' in data & (data.value = 42 || data.value = 84)) server.log('Ha!') The condition is placed within round brackets ( ( and )), and the further instructions within braces ( If the condition evaluates to true, those extra instructions are performed, otherwise they are ignored. The most basic branching structure is based on the keyword if, followed by a condition and some further instructions. They give your program a means to perform a comparison and take one of several code paths according to the result of that comparison. Branching Structuresīranching structures are the embodiment of this idea. These values can represent almost anything that’s relevant to your application, and upon whether the values are the same or different at that moment, will the operations the program performs depend. Which path the program takes is selected by examining a value, typically stored in a variable, and comparing it to another value. Squirrel provides a number of structures that allow you to control the flow of a program: they allow you to set the program to follow one a number of possible paths.

Arduino switch case multiple variables